Molding apparatus.



H. LEHMANN.

MOLDING APPARATUS.

APPLICATION man MAR. 22, 1913;

Patented Ja n.4,-1916.

a saws-sum 1.

H. LEHMANN. MOLDING APPARATUS.

APPLICATION FILED MAR. 22. 19l3.

Patented Jan. 4, 1916.

3 SHEETS-SHEET 2- ,coLUMmA FLANOGRAPH CO..WASHINOTON. D, c.

H. LEHMANN.

MOLDING APPARATUS. APPLICATION FILEDVMAR; 22. 19:3.

Patentd Jan. 4, 1916.

a SHEETS-SHEET 3.

114;: I 4? M A M COLUMBIA PLANOGRAI'H Cm. WASHINGTON, D, c;

HERMANNi LnHMAiin;

UNITED sT TEs PATENT OFFICE.

or AGDEBUBG GERMANY, "assienon, no FRIEDVII KRUEP,

I 'nK'rmNensELLscHAFr, 'enusouwnnx; or 'MAG EBURe-BU AU. GERMANY.

' ivrorizoriver Arrnimrusf To all whom it may concern: f

Be it known that I, HERMANN LEHMANN, a subject of the King of Prussia, and resident of Magdeburg, German Empire, have invented certain new and useful Improvemerits in Molding Apparatus, of which the following is a specification. This invention relates to an improved apparatus for molding arm'eores'for belt pulleys, gear wheels or the like. In belt pulley molding machinesalready known the rim or crown and the hub .may be formed by forming the inner means of concentric, separately displaceable rings. Sector-shaped framesfor'forming arm cores in which thedlameter' of the external sector is variable in accordance,

with the various wheel diameters have also been employed. In order to change the diameter of such frames, in addition to "a displacement of the outer sector in the radial direction, a modification of the curvature is necessary;v this is a difiicult operation and doesnotgive perfect results. 7

According to the present invention the principle ofthe belt pulley molding machine is utilized in a suitable manner for the -formation of sector-shaped frames for the arm, cores used .in castinggear wheels and the like. i i

To form the side faces of thecore four upright plates issue from the molding table. Of these plates two are at a fixed angle relatively to each othertoform the radial faces. The other two plates are selected, according to the internal diameter of the rimand the external diameter of the hub, from' a plurality serve to shapethe curved faces of the core face of the wheel rim and the outer face of the hub. When the core has been rammed and smoothed offthese four plates are lowered into the table and the I core is lifted from the surfacelof' the table by means of supports issuing from the .table.

A constructional .jform 0f machinefernbodying the inventi on'isillustrated by I line C D and illustrate "a section,

of concentric arc shaped plates, and

manner by special forms of specially profiledauxiliary Specification of Letters Fatent. Patented Jan; 4, 1916. App1ication filed. amaze, 1913. Serial 756,155 7 i of 7 example in the: accompanying drawings,

in which two horizontal half see- Fig. 2 represents half being taken onthe tions, ,its' upper tion on'tlie arc line G-H of Fig. 2. Figs. 1 to 3 represent the machine prior to the p its lower half on the .line ;EF of Fig.1. Fig. 3 isa developedseccommencement of operations while Fig. 4:"

- is a section corresponding to Fig. 1, in which the core is already rammed. Figs. 5 and 6 constructional details. Fig.

similar to Fig.3,- of the upper part of themachine taken on the line I-K in.

F ig." 2, but in" the position occupied by the machine in Fig. 4. Fig.8 isa plan view of :Fig. 1 with some parts broken away. Fig. 9 represents a sectioncorresponding to Fig.

1, in which the machine elements resume the position'shown in Figs. 1 to 3, tha-tis to say, j-the corecasing is again withdrawn; the core itself is represented in its raised position.

Fig. 10 shows the finished core in plan View. 1

Fig. 11 isa cross section of twoarm' core pieces formed in accordancewith this embodiment of the invention and laid side by side, and Figsalil 'and13 are similar views to Fig. 11 of core pieces for; arms of T- shaped and cross-shaped transverse section. Fig. 14, aview simila'rto Fig. 7 butshowing an auxiliary frame of different section and; Fig. 15 is a view pieces for rms of oval cross section. Fig. 16, is a horizontal section on line LM of Fig. 1;. Fig. 1f is'a section'online N-O- of Fig. 2; Fig. 18'is a lefthand elevation: of

Fig. 17 with some'parts removed, and Fig.

19 is anelevationof a detail. 1

The outer fixed asegment of a circle is formed in the known 'eachother, as required fora six armed' wheel. For any other number of armsya different angle and therefore a different machine isnecessary... The plates 1 are' con-' casing corresponding to two radial lateral walls 1 and a and rests upon up rights 3. The'radial lateral walls of the similarto Fig. 11 of core I nectedby an upright" 5 at the ape; of the angle see Figs. 2, 4, and 8. Between the radial walls and the sector shaped wall 2 are located a number of coaxial are shaped plates 7 lying against one another but displaceable vertically independently of each other. In their lowest position, which corre' sponds to the inoperative condition of the machine (Figs. 1 to 3 and 9), these plates 7 rest upon a cross beam 8 secured to the uprights 3 of the machine casing. One of the plates 7 serves for forming the inner face of the wheel rim and another plate serves for forming the outer face of the hub. The following means is employed for displacing the are shaped plates 7 and the plates 4 forming the radial walls of the core casing: Guide and supporting strips or ledges 6 are mounted on a platform 9 and engage the plates 4:; guides 10, 11 and 12 are also provided upon each of which the lower end or foot of a rod 13 is slidable. These rods 13 serve for lifting the are shaped plate forming the inner face of the wheel rim. The lower end or fcot of a rod 14 is also slidably mounted on the middle guide 11 and serves for lifting the are shaped plate which forms the outer face of the hub, compare Fig. 5. For this purpose, all the rods 13 and 14: engage by means of heads 15 in undercut notches 16 (Fig. 3) in the are shaped plates 7.] In the example here illustrated the upper ends of the rods 13 14 are so wide that they always lift three are shaped plates simul taneously, the inner of these plates serving f r forming and the other two for stiffening the first. The platform 9 can be lifted in any convenient manner. In the apparatus shown hydraulic lifting mechanism is used in which the platform is connected with a piston 18 capable of vertical displacement in a cylinder 19. To regulate and limit the movement of the platform 9 and consequently the vertical displacement of the plates 1 and 7 as desired, the plates 4, see Fig. 17 which are rigidly connected with the platform 9, are provided with bars or ledges 20 upon which the steps 22 are secured. These stops are provided with fine adjusting screws 21 which encounter the lower edge of the casing 1 if the platform 9 is raised, see Fig. 17. The screws 21 are socured in such a manner that they can be dis placed and retained at any desired height. The core is lifted by means of rods 23 dis tributed in groups over the core casing (Fig. 8) and displaceably secured in the are shaped plates 7 (Figs. 1, 4 S and 9); their lower ends protrude from the are shaped plates. If desired their upper ends can be covered with small plates 2% in order to prevent injury to the core. The following glevice is employed for lifting these rods 3: By means of arms 27'guide pieces 28 are fixed on uprights 25 which are capable of platform 9 carrying the plates l face of the hub.

vertical displacement in guides 26 forming part of the fixed frame of the machine. Upon these guide pieces 28 supports 29 are displaceable; before the core is lifted these supports are inserted beneath the lower ends of the rods 23 (Fig. 4:, position of the sup ports 29 shown in broken lines). The radius of the arm cores 17 determines below which of the groups of rods 23 the supports 29 are inserted. The uprights 25 with the arms 27, the guide pieces 28 and the supports 29 can be lifted in any convenient manner. In the example here illustrated this is effected positively upon the downward movement of the and the raised are shaped plates 7. l Vith this object in view two levers are mounted on the fixed machine frame each lever having two opposing arms 30, 31. The. inner arm 30 of each of these double levers inter-engages and cooperates with a tappet'32 arranged upon the under side of the platform 9 (Figs. 3, and 6), the outer lever arms 31 engaging with the uprights 25 (Figs. 3 and 6).

For molding special arm cross sections, such as I-shaped, .l.-shaped oval, and so forth, auxiliary frames 33, 3e are employed. It is only in forming arms of I cross section such as are commonly used for gear wheels and are selected by way of example in Figs. 4c and 7 to 11, that both frames are used simultaneously (Figs. 4:, 7 and 8). In the case of other cross sections one frame is sufiicient, as for example with oval and L shaped cross sections of the core as hereinafter described and illustrated in Figs. 13 to 15, in which the cores are formed of two superposed parts.

The auxiliary frames 33, 34: correspond externally and internally to a circular segment. The radial portions of the frames serve, together with the plates 4, for molding the arm cross section and the are shaped portions, together with the raised are shaped plates 7, for molding the inner face of the rim and outer face of the hub respectively, with the rim and hub extensions. One of the frames 33 is intended to be placed upon the molding table and the bottomof the core casing formed by the surface of the arc shape plates 7 which are located in their lowest position. The frame 33 is connected through an outer are 35 with the are shaped plate 7 serving to mold the inner face of the rim (Figs. 4 and S), a different frame 33 being necessary for each internal rim diameter. On the other hand a single frame 33 can be employed for various hub diameters. Vith this object the diameter of the inner are 36 of the frame 33 is made con siderably larger than that of the innermost of the are shaped plates 7, leaving in many cases a space between the are 36 and the are shaped plate serving for molding the outer This space is tilled by liftmanage-42 ing the intermediate plates 7 to an extent corresponding to the height of. the frame (Fig. 4). This is effected by plates 38 see Fig. '19 corresponding in thickness to that of the plates 7 and having heads 37 of the same form as the heads 15 of the rods 13,

14', which heads 37 engagerin the middle undercut slot 16 in the plates 7. They are inserted in the slot 16from below in the manner ofa'bayonet joint. A number of these plates corresponding to-the number of are shaped plates required for filling theins terstic'e referred to above are "inserted; in the middle slot 16 and held together and in con; tact with therod 14' by ascrew 40 passing through a slot 39 in said rod. A stop 53 adjustable to different heights upon therod 14 by means of a screw 52 serves for lifting the plates 38. With thi's object the screw 52 passes through the slot 39; in the rod 14.

The other auxiliary frame 34 is fitted upon the core casing (Figs. 4 and An are shaped member 41 isused to form the rim extension and is secured in such 'amanner as to be readily detachable upon a "stir-.

rup 43 connected with the frame 34 by means of screws 42'. A different member 41 is used for-each rim diameter. On the other hand the stirrups correspondingto the various rim diameters can be secured upon the frame indifferent positions by means of the holes 44, or their adjustment may of course "be effected in any other convenient manner.

-The frame is secured in this position by a nut 47 on a bolt 48 rigidly attached upon the connecting member" 5 of the plates 4 (Fig. 4). The nut has an annular groove 49 in which a fork-shaped'projection 50 from the frame 34 engages so that the forked projection 50 together withthe frame 34 partakes in any outward or inward displacement of the nut. By screwing up the nut 47 the frame is pressed radially outward, that is toward the left of Figs. 4 and 8 while when the nut is turned back the frame is drawn radially inward. I The operation of the machine will now be described first in connection with the molding of awheel with arms of I-shaped cross section. Before the work begins the machine occupies the position illustrated in Figs. 1 and 3. In the first place the rods 13, 14 are adjusted on their guides 10, 11, 12 in such a manner that they come ben'eath the are shaped plates 7 which correspond tothe diameter of the rim and hub respectively,

and the stops 22' are adjusted on thebars 20 in correspondence with the required height of the core casing: The auxiliary. frame 33 corresponding to the desired cross section is then placed uponthe arc shapedzplates 7.

If "a space should remain between-the are shaped plate whiclimold's the outer face of the hub landthe inner are shaped portion 36 of the auxiliary'frame, such. space is filled-by. further plates 7, as many plates 38 as the number? of plates 7-that are required being inserted in the mannerhere inbefore described,-in the middle 'undercut slot 16 and then passed to the. rod

14; :The plates 38 are-then suspended by theirfheads 37 in the middle slot of the plates 7'that they'are to lift. To retain them in this-position, the screw 40. isrpassed through them and thegislot 39 in the rod 14 and'tighten'ed to suchf'an extentthat the plates-38 are held together and in loose contact with the rod '14. Thereupon'the'stop 53 is secured upon the rod 14 bymeans of the, screw 52 at such a height that the are -shaped plates that are intended for filling the aforesaid space are raised as far as the upper edge .of the auxiliary, frame 33' when the platform 9 ascends. Theplatform 9 is then raised "by means of the'piston 18 until the stops 22 encounter the lower edge of -the casing walls l-see Fig. 17. The are shaped plates 7 which form the core casing and the plates 4 rise-with the platform 9.

In the first place the plates 38 remainfstati'ona ry' as owing to their loose connection with the rod 14 the slot 39 in-the latter slides over the screw 40. It is" only in the latter part of the upward movement of the platform 9 that the st0p'53'strikes against the plates 38 from below and'lifts them'and 'Withthem the are shaped plates located above them to such an extent that the'upper edge of the latter comes flushwith the upper edge of the frame 33. The small plates 24 are then placed upon those of the rods 23 that are subsequently to lift the core. The coreis rammed in the usual manner up to the up'peredge ofthe core casing. The upper auxiliary frame 34 is then placed upon the core casing, the fork-shaped projection 50 engaged with thefannular groove 49 in the nut 47 and then,by screwing up the nut 47, theaauxiliary frame 34 is displ'aced radially outward. By this means its hook shaped projections 45 engage in the recesses 46 in the plates 4. -The are shaped part 41 corresponding to "the lnternal rim diameter in question .is fixed upon the stirrup 143 and the latter secured in the proper-position on the auxiliary frame '34. The core piece is finally rammed and smoothed off when the parts assume the po- 7 sition shown in Figs. 4 and 7. V V

- Inor'de'r to withdraw the core; in the first auxiliary frame 3 1 and removed together with the arc shaped part 1-1. By screwing back the nut d7 the frame is displaced radially inward so that the projections 45 are disengaged from the recesses 46, whereupon the frame 3% is removed. The supports 29 are then inserted beneath the rods 23 to be lifted (position indicated in broken lines in Fig. 4-) and the platform, and with it the plates 4 previously raised, and the rods 13, 14 are lowered. The T-shaped heads 15 of the rods 13, 14 inserted in the undercut slots 16 draw down the are shaped plates previously raised when these rods descend.

The are shaped plates raised as far as the upper edge of the auxiliary frame 33 first of all remain stationary, as the slot 39 in the rod 14: slides'over the screw 40. In the latter part of the descent of the platform 9 the upper limitingLedge of the slot 39 in the rod 14 strikes against the screw 40 and draws it and the plates 38 downward. By means, of their T-shaped heads 37, which are inserted in the undercut slots 16, these plates draw the plates 7 downward. Furthermore, in the latter part of the descent of the platform 9 the tappet 32 strikes the lever arms 30 and depresses them, by which means the lever arms 31 are raised, as are also the rods 23 by means of the parts 25, 27, 28 and By the intermediary of the small plates 2%: these rods lift the core from the casing. The parts then assume the position shown in Fig. 9.

If it be desired to clean the machine before preparing the next core, the supports 29 are displaced to such an extent that the rods 23 can descend past them. The rods 23 slide downward under the influence of gravity or they can be depressed by hand. This displacement is limited by enlargements 51 on the rods 23, see Fig. 7 in such a manner that the upper edge of the rods 23 when occupying their lowest position are level with the upper edge of the plates 7.

If it be desired to use the same lower auxiliary frame not only for various hub diameters, but also for various rim diameters, or if it be desired to strengthen the rim extension by prolonging it toward the center of the wheel, a lower auxiliary frame 33 is inserted in which the outer diameter of the outer are shaped part 35 is smaller than the internal diameter of the arc shaped plate which molds the inner face of the rim. The space that then remains between this outermost of the raised plates 7 and the arc shaped part 35, is filled by slightly lifting further plates 7 in the manner already described in connection with the part 36 and the inner raised plate 7. In this case one or more of the rods 13 must be slotted in the same manner as the rod 14 and also provided with plates 38 and stops53 see Fig. 1.

and in what manner the same is to be performed, I declare that what I claim is 2- 1. In an apparatus for molding cores of sector-shape; two radial plates rigidly connected and situated at a permanent angle, a plurality of concentrically curved plates fitting between said radial plates, each of said curved plates constructed to be lowered into the molding table; said radial plates and a selected pair of said curved plates of different radii, together forming the side faces of the core.

2. In an apparatus for molding cores of sector-shape; two radial plates rigidly connected and situated at a permanent angle, a plurality of concentrically curved plates fitting between said radial plates, each of said curved plates constructed to be lowered into the molding table; and adjustable stops for said curved plates limiting the vertical position of the curved plates according to the thickness of the core; said radial plates and a selected pair of said curved plates of differ ent radii, together forming the side faces of the core.

3. In an apparatus for molding cores of sector-shape; two radial plates rigidly connected and situated at a permanent angle, a plurality of concentrically curved plates litting between said radial. plates, each of said curved plates constructed to be lowered into the molding table; and adjustable stops for said curved plates limiting the vertical position of the curved'plates according to the thickness of the core; said radial plates and a selected pair of said curved plates of diflerent radii, together forming the side faces of the core; and means for raising the four plates together with said stops relatively to the molding table.

4L. In an apparatus for molding cores of sector-shape; two radial plates rigidly connected andsituated at a permanent angle, a plurality of concentrically curved plates fitting between saidradial plates, each of said curved plates constructed to be lowered into the molding table; said radial plates and a selected pair of said curved plates of different radii, together forming the side faces of the core; and means for lifting the finished core from the table after the plates have been lowered.

V5.'In an apparatus for molding cores of;

V plurality of concentrically'curved plates fitting between said radial plates, each of said curved plates constructed to be lowered into the molding table; saidradial plates and a selected pair of said curved plates of different radii, together forming the side faces of the core; an auxiliary frameito be used in conjunction with said plates for molding complex shaped cores.

6. In an apparatus for molding cores of sector-shape; two radial plates rigidly connectedand situated at a permanent angle, a plurality of concentrically curved plates fitting between said radial plates', each of said curved. plates constructed to be lowered into the molding table; and adjustable stops for said curved plates limiting the vertical position of the curved plates according tothe thickness of the core; said radial plates and a selected pair of said curved plates of dilferent radii, together forming the side'faces of the core; and means for raising the four plates together with said stops relatively to 'the molding table; a lower auxiliary. sectorshaped frame inserted in said radial plates and an upper auxiliarysector-shaped frame placed on top thereof for the purpose of molding complex shaped cores.

7. In an-apparatusfor molding cores of sector-shape; two radial plates rigidly connected and situated at a permanent angle, a

plurality of concentrically curved plates fitting between said radial plates, each of said curved plates constructed to be lowered into the molding table; and adjustable stops for said curved plates limiting the vertical position of the curved platesaccording to the thickness of the core said radialplates and a selected pair of said curved plates of different radii, together forming the side faces I of the core; and means for raising the four plates together with 'said stops relatively to the molding table; a lower auxiliary sectorshaped fr'ameinserted in said radial puma and an upper auxiliary sector-shapedframe placed on top thereof for the purpose of molding complex shaped cores,- said lower auxiliary. frame being'sho'rter than the distance between the two raised curved plates," the innerand outer face'of sald lower frame being concentrically 3 curved; means for partly raising a plurality-of said arcuate plates to form'fillers when needed between said lower-frame and the two raised arcuate plates. j r

8. Inan apparatus for molding cores of sector-shape, two radial plates rigidly connected an'd situated ata permanent angle, a

plurality of concentrically curved plates fitting between said radial plates, each of said curved plates constructed to be lowered into the-molding table; and adjustable stops for curved plate of smaller radius.

said curved plates limiting the vertical position of the curved plates according to the thickness of the coreysa'id radial plates and a selected pair of'said curved'platesof-diflier- "9. In an apparatus for-molding cores of sector-shape, two radial plates rigidly connected and situated at a permanent angle, a plurality of concentrically curved plates fitting between said radial plates, each of said curved plates constructed to be lowered into the molding table; and adjustable stops-for said curved plates limiting the vertical position of the-curved plates according-to the thickness of the core said radial plates and a selected pairof said curved plates of different'radii, togther forming the side faces of the core; and means for raising the four plates together with saidstops relatively to the molding table; a lower auxiliary sector-. shaped frame inserted in said radial plates and an upper auxiliary sector-shaped frame placed on top thereof for thepurpose of molding complex-shaped cores; means for partly rasing a plurality of said curved plates to form fillers when needed between the inner face of said lower frame and the curved plate of smaller radius; said'last named means comprisinga projection adjustable relative to, and actuated by said first named raising means, an, extension plate suspended from each of said plates to be partially raised, saidextension plates positioned-to be engaged by. said projection.

-10. In an apparatus for molding'cores of sector-shape; two radialplates rigidly 'connected'and situated at a permanent angle,

a plurality of concentrically-curved plates fitting between said radial plates,:each of said curved plates constructed to be lowered intov the molding table; and adjustable stops for said curved plates limiting the ver tical position ofthe curved plates'according to the "thickness of the core; said radial plates and a selected pair. ofsaid curvedplates of different radii, together forming the side faces of the core; and means'for raising the four plates'together with'said Stopsfrelatively to the molding table;--a

lower auxiliary sector-shaped frame inserted in said radial plates and an upper. auxiliary' sector-shaped frame placed on top thereof for the purposerof molding complex shaped cores, said lower frame'bearing against the inner surface of the curved plates of the greater radius, the inner face of said lower frame being arcuate to correspond with a hub of a fixed comparatively large diameter. I

11. In an apparatus for molding cores of sector-shape; two radial plates rigidly connected and situated at a permanent angle, a plurality of concentrically curved plates fitting between said radial plates, each of said curved plates constructed to be lowered into the molding table; andadjustable stops for said curved plates limiting the vertical position of the curved plates according to the thickness of the core; said radial plates and a selected pair of said curved plates of different radii, together forming the side face of the core; and means for raising the four plates together with. said stops relatively to the molding table;- a lower auxiliary sector-shaped frame inserted in said radialiplates and an upper auxiliary sectorshapedframe placed on top thereof for the purpose of molding complex shaped. cores; said lower frame bearing against the inner surface of the curved plate of the greater radius, the inner face of said lower frame beingarcuate to correspondwitha hub of a fixed comparatively large diameter; means for partly raising a plurality of said curved plates to form fillers when needed between the inner face of said lower frame and the curved 1 plate of smaller radius.

12. In an apparatus for molding cores of sector-shape; two radialplates rigidly connected and situated'at a permanent angle, a plurality of concentrically curved plates fitting between said radial plates,reach of said curved plates constructed to be lowered into ithemolding table; and adjustable stops for said curved plates limiting the vertical position of the curved plates according to the thickness of the core; said radial plates and a selected pair of said curved-plates of different radii, together forming the'side faces ofthe core; and means for raising the four plates together with said stops relatively to ,the'molding table; a lower auxiliary sector-shaped frame inserted in said radial plates and an upper auxiliary sectorshaped frame placed on top thereof for the purpose of molding complex shapedcores, said lower frame bearing against the inner surface of the curved plate of the greater radius, the inner face of saidlower frame being arcuateto correspond with a hub of a fixed comparatively large diameter; means for partly raising a plurality of said curved plates to form fillers when needed between the inner face of said lower frame andthe curved plate of smaller radius; said last named means comprising a projection adjustable'i relative; to, and actuated by said first named raising means, an extension plate suspended from each of said plates to, be

partially raised, said extension plates positioned to be engaged by said projection.

13. In an apparatus for molding cores of sector-shape; two radial plates rigidly connected and, situated at a permanent angle, a plurality of concentrically curved plates fitting between said radial plates, each of said curved plates constructed to be lowered into the molding table; and adjustable stops for said curved plates limiting the vertical posit-ion of the curved plates according to the thickness of the core; said; radial plates and a selected pair of said curved plates of different radii, together forming the side faces of the core; and means for raising-the four plates together with said stops relatively to the molding table; a lower auxiliary sector-shaped frame inserted in said radial plates and an upper auxiliary sector-shaped frame placed on top thereof for the purpose of molding complex shaped cores, said lower auxiliary frame being shorter than the'distance between the two raised curved plates, the inner face of said lower frame bearing against the raised curved plate of the smaller radius.

14:. In an apparatus fortmoldingcores of sector-shape; two radial plates rigidly connected and situated at a permanent angle, a plurality of concentrically curved plates fitting between said radial plates,seach of said curved plates constructed to be lowered into the moldingtable; and adjustable stops for said curved plates limiting the vertical position of the. curved plates according to the thickness of the core; said radial plates and a selected pair of said curved plates of different radii, together formingihe side faces of the core; and means for raising the four plates together with said stops rela tively to the molding table; a lower auxiliary sector-shaped frame inserted in said radial plates and an upper auxiliary sectorshaped frame placed on top thereof for the purpose of molding complexshaped cores,

said lower auxiliary frame being shorter than the distance between the two raised curved vplates, the inner face of said lower frame bearing against the raised curved plate of the smaller; radius;. meansfor partly raising plurality of said curved plates .to form fillers when needed between the exterior face'of said lower frame and the curved plate of greater radius.

15. In an apparatus for. molding cores of sector-shape; two radial plates rigidly connected and situated at a; permanent angle; a plurality of concentrically curved plates fittingbetween said radial plates, each of said curved plates constructed to belowered into the molding table; andadjustab-le stops for said curved plates limiting-the vertical-position, of thecurved plates according; to the thickness of the core; said radial plates and aselected pair of said curved plates of difthe inner face of said lower frame-bearing against the raised curved plate of the smaller radius; means for partly raising a plurality ofsaid curved plates to form fillers when needed between the exterior face of said lower frame and,the curved plate of greater radius; said last-named means comprising a projection adj'ustable'relative to, and actuated by said first-named raising means, an extension plate suspended fromeach of said plates to be partially raised, said extension plates positioned to be engaged by said projection.

16. In an apparatus for molding cores of sector-shape; two radial plates rigidly connected and situatedat a permanent angle,

a plurality of concentrically curved plates fitting between said radial plates, each of said curved plates constructed to be lowered into the molding table; and adjustable stops for said curved plates limiting the vertical position of the curved plates according to the thickness of the core; said radial plates and a selected pair of said curved plates of different radii, together forming the side faces of the core; and means for raising the four plates together with said stops relatively to the molding table; a lower auxil- Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, g

iary sector shaped frame inserted in said radial plates andan'upper auxiliary sector shaped frame placed on top thereof for the purpose of molding complex shaped cores;

said upper auxiliary frame having ,an' adjustable stirrup, an arc shaped member detachably mounted on said stirrup and forming a rim extension. 17. In an apparatus for moldingcores of sector-shape; two radial plates rigidly connected and situated at a permanent angle, a

plurality of concentrically curved plates fit tingbetween said radial plates, each of saidcurved plates constructed to be lowered into the molding'table; and adjustable stops for said curved plates limiting the vertical position of the curved plates according to the thickness of the core; said radial platesand a selected pair of said curved plates of dif-V ferent radii, together forming the side faces of the core; and means for raising the four plates together with said'lstops relatively to the molding table; alower auxiliary sector shaped frame inserted in said radial plates 7 and an upperauxiliary sector-shaped frame placed on top thereof for the purpose of molding complex shaped cores; interengaging members on said upper auxiliary frame and said radial plates, the upper auxiliary frame being radially displaceable for engaging and disengaging said members. v

The foregoing specification signed at Madgeburg, this 8th day of March, 1913.

HERMANN LEHMANN.

In presence of, I

I-IERMANN STEPHANI, OSCAR MARxIso vWashington, D. G;. 

